How to Calculate Fuse Ratings for AC Motor Protection Based on Motor Horsepower (hp)
Motor horsepower and motor full load amps (FLA) shown are taken from NEC® Tables 430.248 and 430.250
covering standard speed AC motors with normal torque characteristics. Fuse ratings for motors with
special characteristics may need to vary from given values.
If motor running protection will be provided by the fuses, select fuse ratings for corresponding
motor type from the tables labeled "Without Overload Relays."
If overload relays will provide principle motor running protection, select fuse ratings for corresponding
motor type from the tables labeled "With Overload Relays." Fuse ratings selected from these
columns coordinate with most UL Class 10 and 20 overload relays which cover over 90% of the motor applications.
1/6 |
4.4 |
5 |
5 |
5 6/10 |
5 6/10 |
30 |
1/4 |
5.8 |
7 |
6 1/4 |
7 1/2 |
7 |
30 |
1/3 |
7.2 |
9 |
8 |
9 |
9 |
30 |
1/2 |
9.8 |
12 |
10 |
15 |
12 |
30 |
3/4 |
13.8 |
15 |
15 |
17 1/2 |
17 1/2 |
30 |
1 |
16.0 |
20 |
17 1/2 |
20 |
20 |
30 |
1 1/2 |
20.0 |
25 |
20 |
25 |
25 |
30 |
2 |
24.0 |
30 |
25 |
30 |
30 |
30 |
1/6 |
2.2 |
2 1/2 |
2 1/2 |
2 8/10 |
2 8/10 |
30 |
1/4 |
2.9 |
3 1/2 |
3 2/10 |
4 |
3 1/2 |
30 |
1/3 |
3.6 |
4 1/2 |
4 |
4 1/2 |
4 1/2 |
30 |
1/2 |
4.9 |
5 6/10 |
5 6/10 |
6 1/4 |
6 |
30 |
3/4 |
6.9 |
8 |
7 1/2 |
9 |
8 |
30 |
1 |
8.0 |
10 |
9 |
10 |
10 |
30 |
1 1/2 |
10.0 |
12 |
10 |
15 |
12 |
30 |
2 |
12.0 |
15 |
12 |
15 |
15 |
30 |
3 |
17.0 |
20 |
17 1/2 |
25 |
20 |
30 |
5 |
28.0 |
35 |
30* |
35 |
35 |
60 |
7 1/2 |
40.0 |
50 |
45 |
50 |
50 |
60 |
10 |
50.0 |
60 |
50 |
70 |
60 |
60 |
*Fuse reducers required
|
1/2 |
2.5 |
2 6/10 |
2 1/2 |
3 |
2 8/10 |
30 |
3/4 |
3.7 |
4 |
3 1/2 |
4 1/2 |
4 |
30 |
1 |
4.8 |
5 |
4 1/2 |
5 6/10 |
5 |
30 |
1 1/2 |
6.9 |
7 |
6 1/4 |
7 1/2 |
7 |
30 |
2 |
7.8 |
9 |
8 |
10 |
9 |
30 |
3 |
11.0 |
12 |
12 |
15 |
15 |
30 |
5 |
17.5 |
20* |
20 |
25 |
25 |
30 |
7 1/2 |
25.3 |
30* |
25* |
35 |
30* |
60 |
10 |
32.2 |
40 |
35 |
45 |
40 |
60 |
15 |
48.3 |
60 |
50 |
70** |
60 |
60 |
20 |
62.1 |
75 |
70 |
80 |
75 |
100 |
25 |
78.2 |
90 |
80 |
100 |
90 |
100 |
30 |
92.0 |
110 |
100* |
125 |
110 |
200 |
40 |
120.0 |
150 |
125 |
150 |
150 |
200 |
50 |
150.0 |
175* |
150 |
200 |
175 |
200 |
60 |
177.0 |
200* |
200* |
225 |
225 |
400 |
75 |
221.0 |
250 |
250 |
300 |
300 |
400 |
100 |
285.0 |
350* |
300 |
400 |
350 |
400 |
125 |
359.0 |
400* |
400* |
450 |
450 |
600 |
150 |
415.0 |
500 |
450 |
600 |
500 |
600 |
*Fuse reducers required
|
**100 Amp switch required
|
1/2 |
2.2 |
2 1/2 |
2 1/4 |
2 1/2 |
2 1/2 |
30 |
3/4 |
3.2 |
3 1/2 |
3 2/10 |
3 1/2 |
3 1/2 |
30 |
1 |
4.2 |
4 1/2 |
4 |
4 1/2 |
4 1/2 |
30 |
1 1/2 |
6.0 |
6 1/4 |
5 6/10 |
7 |
6 |
30 |
2 |
6.8 |
8 |
7 1/2 |
9 |
8 |
30 |
3 |
9.6 |
12 |
10 |
12 |
12 |
30 |
5 |
15.2 |
17 1/2 |
17 1/2 |
20 |
17 1/2 |
30 |
7 1/2 |
22.0 |
25 |
25 |
30 |
30 |
30 |
10 |
28.0 |
35 |
30* |
35 |
35 |
60 |
15 |
42.0 |
50* |
45 |
60 |
50 |
60 |
20 |
54.0 |
60* |
60* |
70 |
70 |
100 |
25 |
68.0 |
80 |
75 |
90 |
80 |
100 |
30 |
80.0 |
100 |
90 |
100 |
100 |
100 |
40 |
104.0 |
125 |
110 |
150 |
125 |
200 |
50 |
130.0 |
150 |
150 |
175 |
150 |
200 |
60 |
154.0 |
175 |
175 |
200 |
200 |
200 |
75 |
192.0 |
225 |
200* |
250 |
225 |
400 |
100 |
248.0 |
300 |
250 |
350 |
300 |
400 |
125 |
312.0 |
350 |
350 |
400 |
400 |
400 |
150 |
360.0 |
450 |
400* |
450 |
450 |
600 |
200 |
480.0 |
600 |
500 |
600 |
600 |
600 |
*Fuse reducers required
|
1/2 |
1.1 |
1 1/4 |
1 1/8 |
1 1/4 |
1 1/4 |
30 |
3/4 |
1.6 |
1 6/10 |
1 6/10 |
1 8/10 |
1 8/10 |
30 |
1 |
2.1 |
2 1/4 |
2 |
2 1/4 |
2 1/4 |
30 |
1 1/2 |
3.0 |
3 2/10 |
2 6/10 |
3 1/2 |
3 |
30 |
2 |
3.4 |
4 |
3 1/2 |
4 1/2 |
4 |
30 |
3 |
4.8 |
5 6/10 |
5 |
6 |
5 6/10 |
30 |
5 |
7.6 |
9 |
8 |
10 |
9 |
30 |
7 1/2 |
11.0 |
12 |
12 |
15 |
15 |
30 |
10 |
14.0 |
17 1/2 |
15 |
17 1/2 |
17 1/2 |
30 |
15 |
21.0 |
25 |
20 |
30 |
25 |
30 |
20 |
27.0 |
30* |
30* |
35 |
35 |
60 |
25 |
34.0 |
40 |
35 |
45 |
40 |
60 |
30 |
40.0 |
50 |
45 |
50 |
50 |
60 |
40 |
52.0 |
60* |
60* |
70 |
60* |
100 |
50 |
65.0 |
80 |
70 |
90 |
75 |
100 |
60 |
77.0 |
90 |
80 |
100 |
90 |
100 |
75 |
96.0 |
110 |
110 |
125 |
125 |
200 |
100 |
124.0 |
150 |
125 |
175 |
150 |
200 |
125 |
156.0 |
175 |
175 |
200 |
200 |
200 |
150 |
180.0 |
225 |
200* |
225 |
225 |
400 |
200 |
240.0 |
300 |
250 |
300 |
300 |
400 |
*Fuse reducers required
|
1/2 |
0.9 |
1 |
8/10 |
1 |
1 |
30 |
3/4 |
1.3 |
1 1/4 |
1 1/4 |
1 4/10 |
1 4/10 |
30 |
1 |
1.7 |
1 8/10 |
1 6/10 |
1 8/10 |
1 8/10 |
30 |
1 1/2 |
2.4 |
2 1/2 |
2 1/4 |
2 8/10 |
2 1/2 |
30 |
2 |
2.7 |
3 2/10 |
2 8/10 |
3 1/2 |
3 2/10 |
30 |
3 |
3.9 |
4 1/2 |
4 |
5 |
4 1/2 |
30 |
5 |
6.1 |
7 1/2 |
7 |
8 |
7 1/2 |
30 |
7 1/2 |
9.0 |
10 |
10 |
12 |
12 |
30 |
10 |
11.0 |
12 |
12 |
15 |
15 |
30 |
15 |
17.0 |
20 |
17 1/2 |
25 |
20 |
30 |
20 |
22.0 |
25 |
25 |
30 |
30 |
30 |
25 |
27.0 |
30* |
30* |
35 |
35 |
60 |
30 |
32.0 |
40 |
35 |
40 |
40 |
60 |
40 |
41.0 |
50 |
45 |
60 |
50 |
60 |
50 |
52.0 |
60 |
60 |
70** |
60 |
60 |
60 |
62.0 |
75 |
70 |
80 |
75 |
100 |
75 |
77.0 |
90 |
80 |
100 |
90 |
100 |
100 |
99.0 |
110 |
110 |
125 |
125 |
200 |
125 |
125.0 |
150 |
125 |
175 |
150 |
200 |
150 |
144.0 |
175 |
150 |
200 |
175 |
200 |
200 |
192.0 |
225 |
200* |
250 |
225 |
400 |
*Fuse reducers required
|
**100 Amp switch required
|
Without Overload Relays:
With Overload Relays:
Motor HP |
Full Load Amps |
Horsepower (HP) |
Switch or Fuse Clip Rating |
Service Factor ≥ 1.15 or with Rise ≤ 40°C |
Service Factor < 1.15 or with Rise > 40°C |
1/6 |
4.4 |
5 |
5 |
30 |
1/4 |
5.8 |
7 |
6 1/4 |
30 |
1/3 |
7.2 |
9 |
8 |
30 |
1/2 |
9.8 |
12 |
10 |
30 |
3/4 |
13.8 |
15 |
15 |
30 |
1 |
16.0 |
20 |
17 1/2 |
30 |
1 1/2 |
20.0 |
25 |
20 |
30 |
2 |
24.0 |
30 |
25 |
30 |
Motor HP |
Full Load Amps |
Horsepower (HP) |
Switch or Fuse Clip Rating |
Service Factor ≥ 1.15 or with Rise ≤ 40°C |
Service Factor < 1.15 or with Rise > 40°C |
1/6 |
4.4 |
5 6/10 |
5 6/10 |
30 |
1/4 |
5.8 |
7 1/2 |
7 |
30 |
1/3 |
7.2 |
9 |
9 |
30 |
1/2 |
9.8 |
15 |
12 |
30 |
3/4 |
13.8 |
17 1/2 |
17 1/2 |
30 |
1 |
16.0 |
20 |
20 |
30 |
1 1/2 |
20.0 |
25 |
25 |
30 |
2 |
24.0 |
30 |
30 |
30 |
Motor HP |
Full Load Amps |
Horsepower (HP) |
Switch or Fuse Clip Rating |
Service Factor ≥ 1.15 or with Rise ≤ 40°C |
Service Factor < 1.15 or with Rise > 40°C |
1/6 |
2.2 |
2 1/2 |
2 1/2 |
30 |
1/4 |
2.9 |
3 1/2 |
3 2/10 |
30 |
1/3 |
3.6 |
4 1/2 |
4 |
30 |
1/2 |
4.9 |
5 6/10 |
5 6/10 |
30 |
3/4 |
6.9 |
8 |
7 1/2 |
30 |
1 |
8.0 |
10 |
9 |
30 |
1 1/2 |
10.0 |
12 |
10 |
30 |
2 |
12.0 |
15 |
12 |
30 |
3 |
17.0 |
20 |
17 1/2 |
30 |
5 |
28.0 |
35 |
30* |
60 |
7 1/2 |
40.0 |
50 |
45 |
60 |
10 |
50.0 |
60 |
50 |
60 |
*Fuse reducers required
|
Motor HP |
Full Load Amps |
Horsepower (HP) |
Switch or Fuse Clip Rating |
Service Factor ≥ 1.15 or with Rise ≤ 40°C |
Service Factor < 1.15 or with Rise > 40°C |
1/6 |
2.2 |
2 8/10 |
2 8/10 |
30 |
1/4 |
2.9 |
4 |
3 1/2 |
30 |
1/3 |
3.6 |
4 1/2 |
4 1/2 |
30 |
1/2 |
4.9 |
6 1/4 |
6 |
30 |
3/4 |
6.9 |
9 |
8 |
30 |
1 |
8.0 |
10 |
10 |
30 |
1 1/2 |
10.0 |
15 |
12 |
30 |
2 |
12.0 |
15 |
15 |
30 |
3 |
17.0 |
25 |
20 |
30 |
5 |
28.0 |
35 |
35 |
60 |
7 1/2 |
40.0 |
50 |
50 |
60 |
10 |
50.0 |
70 |
60 |
60 |
*Fuse reducers required
|
Motor HP |
Full Load Amps |
Horsepower (HP) |
Switch or Fuse Clip Rating |
Service Factor ≥ 1.15 or with Rise ≤ 40°C |
Service Factor < 1.15 or with Rise > 40°C |
1/2 |
2.5 |
2 6/10 |
2 1/2 |
30 |
3/4 |
3.7 |
4 |
3 1/2 |
30 |
1 |
4.8 |
5 |
4 1/2 |
30 |
1 1/2 |
6.9 |
7 |
6 1/4 |
30 |
2 |
7.8 |
9 |
8 |
30 |
3 |
11.0 |
12 |
12 |
30 |
5 |
17.5 |
20* |
20 |
30 |
7 1/2 |
25.3 |
30* |
25* |
60 |
10 |
32.2 |
40 |
35 |
60 |
15 |
48.3 |
60 |
50 |
60 |
20 |
62.1 |
75 |
70 |
100 |
25 |
78.2 |
90 |
80 |
100 |
30 |
92.0 |
110 |
100* |
200 |
40 |
120.0 |
150 |
125 |
200 |
50 |
150.0 |
175* |
150 |
200 |
60 |
177.0 |
200* |
200* |
400 |
75 |
221.0 |
250 |
250 |
400 |
100 |
285.0 |
350* |
300 |
400 |
125 |
359.0 |
400* |
400* |
600 |
150 |
415.0 |
500 |
450 |
600 |
*Fuse reducers required
|
Motor HP |
Full Load Amps |
Horsepower (HP) |
Switch or Fuse Clip Rating |
Service Factor ≥ 1.15 or with Rise ≤ 40°C |
Service Factor < 1.15 or with Rise > 40°C |
1/2 |
2.5 |
3 |
2 8/10 |
30 |
3/4 |
3.7 |
4 1/2 |
4 |
30 |
1 |
4.8 |
5 6/10 |
5 |
30 |
1 1/2 |
6.9 |
7 1/2 |
7 |
30 |
2 |
7.8 |
10 |
9 |
30 |
3 |
11.0 |
15 |
15 |
30 |
5 |
17.5 |
25 |
25 |
30 |
7 1/2 |
25.3 |
35 |
30* |
60 |
10 |
32.2 |
45 |
40 |
60 |
15 |
48.3 |
70** |
60 |
60 |
20 |
62.1 |
80 |
75 |
100 |
25 |
78.2 |
100 |
90 |
100 |
30 |
92.0 |
125 |
110 |
200 |
40 |
120.0 |
150 |
150 |
200 |
50 |
150.0 |
200 |
175 |
200 |
60 |
177.0 |
225 |
225 |
400 |
75 |
221.0 |
300 |
300 |
400 |
100 |
285.0 |
400 |
350 |
400 |
125 |
359.0 |
450 |
450 |
600 |
150 |
415.0 |
600 |
500 |
600 |
*Fuse reducers required
|
**100 Amp switch required
|
Motor HP |
Full Load Amps |
Horsepower (HP) |
Switch or Fuse Clip Rating |
Service Factor ≥ 1.15 or with Rise ≤ 40°C |
Service Factor < 1.15 or with Rise > 40°C |
1/2 |
2.2 |
2 1/2 |
2 1/4 |
30 |
3/4 |
3.2 |
3 1/2 |
3 2/10 |
30 |
1 |
4.2 |
4 1/2 |
4 |
30 |
1 1/2 |
6.0 |
6 1/4 |
5 6/10 |
30 |
2 |
6.8 |
8 |
7 1/2 |
30 |
3 |
9.6 |
12 |
10 |
30 |
5 |
15.2 |
17 1/2 |
17 1/2 |
30 |
7 1/2 |
22.0 |
25 |
25 |
30 |
10 |
28.0 |
35 |
30* |
60 |
15 |
42.0 |
50* |
45 |
60 |
20 |
54.0 |
60* |
60* |
100 |
25 |
68.0 |
80 |
75 |
100 |
30 |
80.0 |
100 |
90 |
100 |
40 |
104.0 |
125 |
110 |
200 |
50 |
130.0 |
150 |
150 |
200 |
60 |
154.0 |
175 |
175 |
200 |
75 |
192.0 |
255 |
200* |
400 |
100 |
248.0 |
300 |
250 |
400 |
125 |
312.0 |
350 |
350 |
400 |
150 |
360.0 |
450 |
400* |
600 |
200 |
480.0 |
600 |
500 |
600 |
*Fuse reducers required
|
Motor HP |
Full Load Amps |
Horsepower (HP) |
Switch or Fuse Clip Rating |
Service Factor ≥ 1.15 or with Rise ≤ 40°C |
Service Factor < 1.15 or with Rise > 40°C |
1/2 |
2.2 |
2 1/2 |
2 1/2 |
30 |
3/4 |
3.2 |
3 1/2 |
3 1/2 |
30 |
1 |
4.2 |
4 1/2 |
4 1/2 |
30 |
1 1/2 |
6.0 |
7 |
6 |
30 |
2 |
6.8 |
9 |
8 |
30 |
3 |
9.6 |
12 |
12 |
30 |
5 |
15.2 |
20 |
17 1/2 |
30 |
7 1/2 |
22.0 |
30 |
30 |
30 |
10 |
28.0 |
35 |
35 |
60 |
15 |
42.0 |
60 |
50 |
60 |
20 |
54.0 |
70 |
70 |
100 |
25 |
68.0 |
90 |
80 |
100 |
30 |
80.0 |
100 |
100 |
100 |
40 |
104.0 |
150 |
125 |
200 |
50 |
130.0 |
175 |
150 |
200 |
60 |
154.0 |
200 |
200 |
200 |
75 |
192.0 |
250 |
225 |
400 |
100 |
248.0 |
350 |
300 |
400 |
125 |
312.0 |
400 |
400 |
400 |
150 |
360.0 |
450 |
450 |
600 |
200 |
480.0 |
600 |
600 |
600 |
Motor HP |
Full Load Amps |
Horsepower (HP) |
Switch or Fuse Clip Rating |
Service Factor ≥ 1.15 or with Rise ≤ 40°C |
Service Factor < 1.15 or with Rise > 40°C |
1/2 |
1.1 |
1 1/4 |
1 1/8 |
30 |
3/4 |
1.6 |
1 6/10 |
1 6/10 |
30 |
1 |
2.1 |
2 1/4 |
2 |
30 |
1 1/2 |
3.0 |
3 2/10 |
2 6/10 |
30 |
2 |
3.4 |
4 |
3 1/2 |
30 |
3 |
4.8 |
5 6/10 |
5 |
30 |
5 |
7.6 |
9 |
8 |
30 |
7 1/2 |
11.0 |
12 |
12 |
30 |
10 |
14.0 |
17 1/2 |
15 |
30 |
15 |
21.0 |
25 |
20 |
30 |
20 |
27.0 |
30* |
30* |
60 |
25 |
34.0 |
40 |
35 |
60 |
30 |
40.0 |
50 |
45 |
60 |
40 |
52.0 |
60* |
60* |
100 |
50 |
65.0 |
80 |
70 |
100 |
60 |
77.0 |
90 |
80 |
100 |
75 |
96.0 |
110 |
110 |
200 |
100 |
124.0 |
150 |
125 |
200 |
125 |
156.0 |
175 |
175 |
200 |
150 |
180.0 |
225 |
200* |
400 |
200 |
240.0 |
300 |
250 |
400 |
*Fuse reducers required
|
Motor HP |
Full Load Amps |
Horsepower (HP) |
Switch or Fuse Clip Rating |
Service Factor ≥ 1.15 or with Rise ≤ 40°C |
Service Factor < 1.15 or with Rise > 40°C |
1/2 |
1.1 |
1 1/4 |
1 1/4 |
30 |
3/4 |
1.6 |
1 8/10 |
1 8/10 |
30 |
1 |
2.1 |
2 1/4 |
2 1/4 |
30 |
1 1/2 |
3.0 |
3 1/2 |
3 |
30 |
2 |
3.4 |
4 1/2 |
4 |
30 |
3 |
4.8 |
6 |
5 6/10 |
30 |
5 |
7.6 |
10 |
9 |
30 |
7 1/2 |
11.0 |
15 |
15 |
30 |
10 |
14.0 |
17 1/2 |
17 1/2 |
30 |
15 |
21.0 |
30 |
25 |
30 |
20 |
27.0 |
35 |
35 |
60 |
25 |
34.0 |
45 |
40 |
60 |
30 |
40.0 |
50 |
50 |
60 |
40 |
52.0 |
70 |
60* |
100 |
50 |
65.0 |
90 |
75 |
100 |
60 |
77.0 |
100 |
90 |
100 |
75 |
96.0 |
125 |
125 |
200 |
100 |
124.0 |
175 |
150 |
200 |
125 |
156.0 |
200 |
200 |
200 |
150 |
180.0 |
225 |
225 |
400 |
200 |
240.0 |
300 |
300 |
400 |
*Fuse reducers required
|
Motor HP |
Full Load Amps |
Horsepower (HP) |
Switch or Fuse Clip Rating |
Service Factor ≥ 1.15 or with Rise ≤ 40°C |
Service Factor < 1.15 or with Rise > 40°C |
1/2 |
0.9 |
1 |
8/10 |
30 |
3/4 |
1.3 |
1 1/4 |
1 1/4 |
30 |
1 |
1.7 |
1 8/10 |
1 6/10 |
30 |
1 1/2 |
2.4 |
2 1/2 |
2 1/4 |
30 |
2 |
2.7 |
3 2/10 |
2 8/10 |
30 |
3 |
3.9 |
4 1/2 |
4 |
30 |
5 |
6.1 |
7 1/2 |
7 |
30 |
7 1/2 |
9.0 |
10 |
10 |
30 |
10 |
11.0 |
12 |
12 |
30 |
15 |
17.0 |
20 |
17 1/2 |
30 |
20 |
22.0 |
25 |
25 |
30 |
25 |
27.0 |
30* |
30* |
60 |
30 |
32.0 |
40 |
35 |
60 |
40 |
41.0 |
50 |
45 |
60 |
50 |
52.0 |
60 |
60 |
60 |
60 |
62.0 |
75 |
70 |
100 |
75 |
77.0 |
90 |
80 |
100 |
100 |
99.0 |
110 |
110 |
200 |
125 |
125.0 |
150 |
125 |
200 |
150 |
144.0 |
175 |
150 |
200 |
200 |
192.0 |
225 |
200* |
400 |
*Fuse reducers required
|
Motor HP |
Full Load Amps |
Horsepower (HP) |
Switch or Fuse Clip Rating |
Service Factor ≥ 1.15 or with Rise ≤ 40°C |
Service Factor < 1.15 or with Rise > 40°C |
1/2 |
0.9 |
1 |
1 |
30 |
3/4 |
1.3 |
1 4/10 |
1 4/10 |
30 |
1 |
1.7 |
1 8/10 |
1 8/10 |
30 |
1 1/2 |
2.4 |
2 8/10 |
2 1/2 |
30 |
2 |
2.7 |
3 1/2 |
3 2/10 |
30 |
3 |
3.9 |
5 |
4 1/2 |
30 |
5 |
6.1 |
8 |
7 1/2 |
30 |
7 1/2 |
9.0 |
12 |
12 |
30 |
10 |
11.0 |
15 |
15 |
30 |
15 |
17.0 |
25 |
20 |
30 |
20 |
22.0 |
30 |
30 |
30 |
25 |
27.0 |
35 |
35 |
60 |
30 |
32.0 |
40 |
40 |
60 |
40 |
41.0 |
60 |
50 |
60 |
50 |
52.0 |
70** |
60 |
60 |
60 |
62.0 |
80 |
75 |
100 |
75 |
77.0 |
100 |
90 |
100 |
100 |
99.0 |
125 |
125 |
200 |
125 |
125.0 |
175 |
150 |
200 |
150 |
144.0 |
200 |
175 |
200 |
200 |
192.0 |
250 |
225 |
400 |
**100 Amp switch required
|
Distribution and
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